Improvement in combined alarm and door-knob



F. N. GOTTLE. Combined Alarm Bell and Door Knob.

No. 213,547. Patented Mar. 25, 1879.

INVENTDR' ZZLJJVflm/ n. PETERS. PHOTOJ ITH'IGRAPHER, W D

UNITED STATES PATENT QFFIOE.

FREEMAN N. OOTTLE, OF NEWTON, ASSIGNOR OF THREE-FOURTEIS OF HIS RIGHT TOLEVI PARKER, OF SAME PLACE; AND SAID OOTTLE AND PARKER ASSIGNORS TOANDREW J. BAILEY, TRUSTEE, OF BOSTON,

MASSACHUSETTS.

IMPROVEMENT lN COMBINED ALARM AND DOOR-KNOB.

Specification forming part of Letters Patent No. 213,547, dated March25, 1879; application filed February 20, 1878.

To all whom it may concern:

Be it known that I, FREEMAN NORTON 00T- TLE, of Newton, in the State ofMassachusetts, have invented a Combined Alarm-Bell and Door-Knob, ofwhich the following is a specification:

My invention relates to alarm-bells used upon doors to announce theopening of the door and the entrance of a person into the room. Suchbells have heretofore been attached separately to the door or to thedoor-casing, making an inconvenient and unsightly addition, or have beenplaced as a part of the lock within the door itself, in which case thesound of the bell was very much deadened.

My invention consists in making the alarmbell a part of the inner knobof the door, Where it is sounded by turning the knob in opening thedoor. This method of construction renders the whole mechanism compactand neat. It has also the advantage of indicating whether the door towhich it is attached is opening from without or from withinin the formercase the bell being free to vibrate and giving the knob after theremoval of the cap A. Fig. 4. is an end view of the base-plate A,showing the slotted opening.

The body of the knob consists of a metallic shell composed of two parts,A and A, one of these parts being made of bell-metal or other resonantmaterial, and the two being slightly separated to permit of thenecessaryvibration of the metal in ringing. Either part may be used as the bellby makingit of the requisite material. Both parts are rigidly attachedto the spindle D, which passes through the lock and door, and on theopposite end of which is fastened, in the usual manner, an ordinarydoor-knob, B.

The base-plate A is rigidly attached to the door by screws, and is soformed as to constitute a part of the neck of the ,knob. Thestriking-hammer d is placed within the hollow knob A A, so as to strikeupon one of its parts, and is fastened to one end of the spring at, theother end of the spring being attached to the spindle l). The springdpasses through a slotted opening, a in the base-plate A the openingbeing of such a form as to communicate to the spring on turning the knoba reciprocatin g or vibratory movement, causing the hammer to strikeupon the interior walls of the knob A A.

Y I do not claim the specific mechanism for communicatin g motion fromthe spindle to the hammer; nor do I limit myself to the use of theprecise form of mechanism described for that purpose, as other means,as-for example, the use of cog-wheels in connection with the spring-maybe used for that purpose.

What I claim, and desire to secure by Letters Patent, is-

The combination of an alarm contained within the knob of a door-lockwith a bell which forms a part of such knob, and the sound of which ismuffled when the knob is grasped by the hand.

FREEMAN NORTON OOTTLE.

Witnesses J. J. MCDAVITT, CHAS. MIREED.

